Factors Affecting Water Absorption:1. Soil water: The availability of water in the soil directly influences the rate of absorption by the root. 2. Transpiration: More the rate of transpiration more is the rate of absorption. Transpiration directly influences the passive absorption process. Because it creates a suction force in the xylem vessel which extends up … Read more
Give a brief account of the mechanism of fertilization in mammals (PDF). Ans: Fertilization is the process by which male and female gametes unite to form a zygote. Fertilization in mammals can be described as follows: (i) Encounter of spermatozoa with ovum:In terrestrial mammals the male deposits sperms directly into the reproductive tract of the … Read more
Factors Affecting Transpiration in Plants External Factors (i) Atmospheric humidity: The rate of transpiration decreases with the increasing atmospheric humidity. Dry air favours vigorous transpiration. If the atmospheric humidity is more than the humidity present inside the stomatal pore then the atmosphere will not be able to accept more vapour. (ii) Temperature: Increase in temperature increases the … Read more
What is the main Difference Between Prokaryotic and Eukaryotic Cell Table: Differences Between Prokaryotic and Eukaryotic Cells Characteristic Prokaryotic Cell Eukaryotic Cell Size Size of cell is small (1-2 µm by 1-4 µm or less) Greater than 5 µm in diameter Cell wall Present. Cell wall is formed of carbohydrates and proteins Cell wall if … Read more
What is Guttation?lt is the loss of excess water in the liquid form through special water stomata called hydathodes present at the tip of the leaves of several herbaceous plants. The hydathodes are the openings at the tip of xylem elements. These are terminal poressurrounded and subtended by some loose uncutinised non chlorophyllous cells having … Read more
Process of fertilization in plants, Fertilization in Plants Fertilization means the union of two dissimilar gametes in the process of sexual reproduction. In plants, pollination leads to fertilization. Micro sporogenesis is a process, which transforms pollen mother cells into pollen grain, containing a tube nucleus and a generative nucleus. Pollen grains are transferred to the … Read more
What is Blood? Blood is regarded as a modified liquid connective tissue because the cellular elements in it are separated by a considerable amount of liquid intracellular substance called plasma. The blood can be identified as the universal internal environment of the vertebrate body. It is an isotonic red viscous liquid and is heavier than … Read more
Difference between Stomata and Hydathode Stomata Hydathode 1. These are present in the epidermis of leaves and young parts of the stem. 1. These are present at the tips and margins of leaves. 2.These are surrounded by chlorophyll-bearing cells called guard cells. 2.These are surrounded by non-chlorophyllous cells. 3. Stomatal cavity is found below each … Read more
What is Vaccination and Immunization?During a lifetime a person becomes naturally immune to various types of infections due to natural exposure to them. But often such infections tend to be mild or subclinical. There may occur a severe form of infection leading to a fatal form of consequence. Immunity will develop slowly and only if … Read more
What is the key difference between active immunity and passive immunity ppt? What is immunity? The human body has the ability to resist almost all types of organisms or toxins that tend to damage tissues and organs. This capacity is referred to as immunity. There are two types of immunity. A human body possesses a … Read more